Rotation About Center
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
/*
* RotationAboutCenter.java
*
* Created on May 1, 2007, 4:14 PM
*
* Copyright (c) 2007, Sun Microsystems, Inc
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the TimingFramework project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
*
* @author Chet
*/
public class RotationAboutCenter extends JComponent {
/** Creates a new instance of RotationAboutCenter */
public RotationAboutCenter() {
}
protected void paintComponent(Graphics g) {
Graphics2D g2d;
g2d = (Graphics2D)g.create();
// Erase background to white
g2d.setColor(Color.WHITE);
g2d.fillRect(0, 0, getWidth(), getHeight());
// base rectangle
g2d.setColor(Color.GRAY.brighter());
g2d.fillRect(50, 50, 50, 50);
// rotated 45 degrees around origin
g2d.rotate(Math.toRadians(45));
g2d.setColor(Color.GRAY.darker());
g2d.fillRect(50, 50, 50, 50);
// rotated 45 degrees about center of rect
g2d = (Graphics2D)g.create();
g2d.rotate(Math.toRadians(45), 75, 75);
g2d.setColor(Color.BLACK);
g2d.fillRect(50, 50, 50, 50);
// done with g2d, dispose it
g2d.dispose();
}
private static void createAndShowGUI() {
JFrame f = new JFrame("Rotation");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(200, 200);
f.add(new RotationAboutCenter());
f.setVisible(true);
}
public static void main(String args[]) {
Runnable doCreateAndShowGUI = new Runnable() {
public void run() {
createAndShowGUI();
}
};
SwingUtilities.invokeLater(doCreateAndShowGUI);
}
}
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